Merck (MRK) - Get Report scheduled a 9 a.m. EDT call with the media and investors to discuss a "corporate announcement," but the company didn't offer further details.

Merck said the call will be available at 9 a.m. to investors on a listen only basis at (706) 758-9937 or on, and at 10 a.m on (706) 679-7292.

Merck closed Wednesday at $34.93.